Bert, We don't have formal rules...and we go off topic all the time.
I think Carl (who I don't personally know, Hi Carl!
) was just admiring how well it works to keep us on topic when Paul keeps feeding us morsels of his beautiful iris photos.
Don't worry about going off topic...we all do it! ...and Welcome Roberta
(since I don't know you either...and being relatively new I never know if someone else is new, or a long time member just dropping in to say hi!)